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Keyboard Failure Dell Inspiron 580

Hello again,
I've got a customer with what sounds like a memory issue. I want to run Memtest86+ on it, but there is an issue. On bootup, I get "keyboard failure" and I can't enter the BIOS to change the boot device priority so that I can load Memtest86+ from a flash drive or cd. The keyboard works fine once I'm into Windows, but I can't use it before Windows loads.
Things tried:
Reset CMOS.
Unplugged all other usb devices, including card reader internally.
Checked device manager, looks clean.

As it turns out, I may be barking up the wrong tree anyway. I don't know how reliable MemTest by HCI Design (a Windows-based RAM tester) is, but it came up with 0 memory errors over the course of about an hour of running (over 100% coverage). I'm willing to concede that I'm not going to be able to run MemTest86+ as long as MemTest by HCI Design is reliable. I'll make a different post about this customer's main problem (computer shuts off randomly while running programs or trying to print). Thanks for the tips guys and gals.